The Sky High Trail is no problem following but just hasn’t had a trail crew on it in a while.
The Mineshaft Flat spring is year around except possibly in very dry year and very late summer. The spring is located 1/4 mile passed the campground and slightly off trail. Sometimes there is a rock pile noting where the spring trail is. If trouble look in the green areas near the trail and listen for water trickling.
Here is a map: (coordinates: 34.104263, -116.808556)